Originally Posted by Andrew R Stewart

Park has made two tools specific to these rectangular indented cups, both I believe are out of production. The first is the SPA-2


and the HCW-11


The SPA3 (often called the yellow spanner) was in common and actually very durable if somewhat flexy in use. The HCW11 was even less common (as a shop intended tool) and while easier to use would shear off the tabs easily. Andy.